Los Angeles (CNN) -- Police in Orange, California, have charged a woman with one count of attempted murder for allegedly throwing a seven-month-old baby boy from a children's hospital parking garage Monday night, according to a statement from local authorities.

The infant, who was rushed to a trauma center, remains in critical condition, police said.

Sonia Hermosillo, 31, was detained shortly after the incident and remains in custody, Orange police said in a statement Tuesday. No bail has been set, authorities said.

A woman walking near the Orange County Children's Hospital saw the infant fall from the second level of the garage and called police, Sgt. Dan Adams said.

Investigators later interviewed several witnesses and reviewed a surveillance video from the garage. The image of a license plate on a 2000 Chevy Blazer seen leaving the garage shortly after the incident led police to Hermosillo.

Authorities found an empty child seat in Hermosillo's vehicle, according to the statement. Hermosillo's husband reported earlier that both his wife and their seven-month-old son were missing, the statement said.